docs(docsrs): Update to new doc_cfg feature name

Author: epage

src/lib.rs

@@ -1,6 +1,6 @@
 //! > DESCRIPTION
 
-#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+#![cfg_attr(docsrs, feature(doc_cfg))]
 #![warn(clippy::print_stderr)]
 #![warn(clippy::print_stdout)]
 #![allow(non_snake_case)] // TODO: Delete me